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class Solution {

public:

bool isUgly(int num) {

if(num <= 0) return false;

while(!(num & 1)) {

num >>= 1;

}

while(num % 3 == 0) {

num /= 3;

}

while(num % 5 == 0) {

num /= 5;

}

return num == 1;

}

};